diff --git a/src/sage/categories/magmas.py b/src/sage/categories/magmas.py
index 7631a4fcd37..9dbf5a25f25 100644
--- a/src/sage/categories/magmas.py
+++ b/src/sage/categories/magmas.py
@@ -608,9 +608,9 @@ def inverse(self):
                 """
                 Return the inverse of ``self``.
 
-                This an alias for inversion, defined in ``  invert__``.
+                This an alias for inversion, defined in ``__invert__``.
 
-                Element classes should implement ``  invert__`` only.
+                Element classes should implement ``__invert__`` only.
 
                 EXAMPLES::
 
diff --git a/src/sage/rings/number_field/class_group.py b/src/sage/rings/number_field/class_group.py
index 46d0ca8c9d3..04e1b06983a 100644
--- a/src/sage/rings/number_field/class_group.py
+++ b/src/sage/rings/number_field/class_group.py
@@ -184,7 +184,7 @@ def inverse(self):
             sage: ~G(2, a)
             Fractional ideal class (2, a^2 + 2*a - 1)
         """
-        m = AbelianGroupElement.inverse(self)
+        m = AbelianGroupElement.__invert__(self)
         m._value = (~self.ideal()).reduce_equiv()
         return m